Physics
If the length of a simple pendulum is halved then its period of oscillation is

Decreased by a factor 2
Doubled
Halved
Increased by a factor 2

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Physics
Conservation of energy refers to the fact that

No chemical reaction is 100 percent efficient
Energy cannot be created or destroyed but can be converted from one form to another
The entropy of the universe is always increasing
If you conserve energy you will not be as tired

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Physics
Hydro-electric power is a:

Neither renewable nor non renewable resource
A mixture of renewable and non-renewable natural resource
Renewable natural resource
non-renewable natural resource

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